Teenage pregnancy is "contagious" between sisters, researchers in the UK and Norway have claimed.

A study of more than 42,000 Norwegian teenage girls suggested they were more likely to become pregnant if their older sister had a baby as a teenager.

The effect was greatest when the sisters were of a similar age or from a poorer background.

The Family Planning Association said the results may not necessarily apply to the UK but were still interesting.

Factors such as family background and level of education are already known to influence teenage pregnancy. This new research, carried out in conjunction with the University of Bristol, looked at the specific effect sisters have on each other.

"Sisters generally spend more time together than schoolmates or friends and so sisters are likely to be influenced by the behaviour of their siblings," the report said.

They looked at data from children born between 1947 and 1958 to compare families from a similar background from different regions of Norway.

Teenage pregnancy is 'contagious'

I hear it may be sexually transmitted.

I met this girl on Monday
took her for a drink on Tuesday
we were making love by Wednesday
and on Thursday & Friday & Saturday we chilled on Sunday

Or, as happened to me:

I met this girl on Monday
Took her for a drink on Tuesday
She never called or emailed, and I later heard she'd turned lesbian and moved to another country.

What the hell did you do to the poor lass JV?

Not a true story, it just sounded funny in my head... maybe it should have stayed there!

Thought as much, just playing along fella...

Or as Mr Red would say:

Met this girl on Monday
She followed me home on Monday
WTF! Now she's buying cats and stuff! And cars! And fish! And she seems to have commandeered half the wardrobe... oh gawd!